HIGH-SPEED, HIGH-CURRENT SURGE PROTECTORS
PMT/UMT (275) Series
DESCRIPTION
CP Clare’s PMT(275) and UMT(275) Series surge protectors (350-500V and 550-2500V respectively) provide a
high level of protection from high-speed, high-current transient surges. These devices are constructed using a
proprietary semiconductor junction process which results in nanosecond response times combined with peak
current ratings in excess of 20kA.
FEATURES
s
Fast impulse breakdown (≤125% of typical DC
APPLICATIONS
s
s
s
s
breakdown at 5kV/µs)
s
Tight DC breakdown voltage tolerance (±10%)
s
Low capacitance
Test equipment
Video displays
Medical electronics
Instrumentation circuits
STANDARD VOLTAGES
Series
PMT(275)
DC Breakdown
Voltage (typ)
350
400
450
500
550
600
650
750
800
850
1.0
1.5
2.0
2.5
(See detailed specifications for more information.)
Unit
V
V
V
V
V
V
V
V
V
V
kV
kV
kV
kV
UMT(275)
www.cpclare.com
549
HIGH-SPEED, HIGH-CURRENT SURGE PROTECTORS
PMT/UMT (275) Series
SPECIFICATIONS
All characteristics at 25˚C
PMT(275)350
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
SYMBOL
V
BD
V
bd
IR
C
MIN
315
-
10
10
-
500
TYP
350
-
-
-
-
MAX
385
750
-
4
-
PMT(275)400
MIN
360
-
10
10
-
500
TYP
400
-
-
-
-
MAX
440
750
-
4
-
UNITS
V
V
Ω
pF
surges
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
PMT(275)450
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
SYMBOL
V
BD
V
bd
IR
C
MIN
405
-
10
10
-
500
TYP
450
-
-
-
-
MAX
495
750
-
4
-
PMT(275)500
MIN
450
-
10
10
-
500
TYP
500
-
-
-
-
MAX
550
750
-
4
-
UNITS
V
V
Ω
pF
surges
UMT(275)550
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
SYMBOL
V
BD
V
bd
IR
C
MIN
495
-
10
10
-
500
TYP
550
-
-
-
-
MAX
605
688
-
4
-
UMT(275)600
MIN
540
-
10
10
-
500
TYP
600
-
-
-
-
MAX
660
750
-
4
-
UNITS
V
V
Ω
pF
surges
UMT(275)650
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
SYMBOL
V
BD
V
bd
IR
C
MIN
585
-
10
10
-
500
TYP
650
-
-
-
-
MAX
715
813
-
4
-
UMT(275)750
MIN
675
-
10
10
-
500
TYP
750
-
-
-
-
MAX
825
938
-
4
-
UNITS
V
V
Ω
pF
surges
UMT(275)800
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
Europe: 32-11-300868
UMT(275)850
MIN
765
-
10
10
-
500
TYP
850
-
-
-
-
MAX
935
1063
-
4
-
UNITS
V
V
Ω
pF
surges
SYMBOL
V
BD
V
bd
IR
C
MIN
720
-
10
10
-
500
TYP
800
-
-
-
-
MAX
880
1000
-
4
-
North America: 1-800-CPCLARE
Asia: 886-2-2523-6368
Japan: 81-3-3980-2212
550
HIGH-SPEED, HIGH-CURRENT SURGE PROTECTORS
PMT/UMT (275) Series
SPECIFICATIONS
All characteristics at 25˚C
UMT(275)1.0
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
SYMBOL
V
BD
V
bd
IR
C
-
MIN
0.9
-
10
10
-
500
TYP
1.0
-
-
-
-
MAX
1.1
1.25
-
4
-
UMT(275)1.5
MIN
1.35
-
10
10
-
500
TYP
1.50
-
-
-
-
MAX
1.65
1.88
-
4
-
UNITS
kV
kV
Ω
pF
surges
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
UMT(275)2.0
PARAMETER
Device Specifications
DC Breakdown
Impulse Breakdown
Insulation Resistance
Capacitance
Life Ratings
Surge Life
CONDITIONS
100V/s
5kV/µs
100V
1MHz
1kA (PW=20
µs)
SYMBOL
V
BD
V
bd
IR
C
-
MIN
1.8
-
10
10
-
500
TYP
2.0
-
-
-
-
MAX
2.2
2.5
-
4
-
UMT(275)2.5
MIN
2.25
-
10
10
-
500
TYP
2.50
-
-
-
-
MAX
2.75
3.13
-
4
-
UNITS
kV
kV
Ω
pF
surges
MECHANICAL DIMENSIONS
DIMENSIONS
mm
(inches)
19.05
±
0.76
(0.750
±
0.030)
ORDERING INFORMATION
Devices in the PMT/UMT(275) series with other breakdown voltages
in the 350-2500V range are available upon request.
A complete part number is represented by the digits below. Break-
down voltages are expressed in Volts for devices <1000V and kV for
devices
≥1kV.
For example, PMT(275)350 is a 350V PMT(275) series
device, and UMT(275)2.0 is a 2kV UMT(275) series device.
1.93
±
0.13 DIA.
(0.076
±
0.005)
4.75
±
0.76
(0.187
±
0.030)
5.00
±
0.76 MAX.
(0.197
±
0.030)
8.00
±
0.13 DIA.
(0.315
±
0.005)
PMT(275) XXX
UMT(275) XXX
UMT(275) X.X
Series
PMT(275)
UMT(275)
for 350-500 V
for 550-850 V
for 1.0-2.5 kV
Breakdown Voltage
See specification tables
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